Did Emily Dickinson write other poems in the same tone as "I heard a Fly buzz -when I died-"?
I think that there are several poems where Dickinson reflects on death as if she is an active part in the events. I would say that "I Felt a Funeral, in my Brain" contains a similar tone to "I hear a Fly Buzz," as does "After Great Pain, a Formal Feeling Comes," "Twas like a Maelstrom, With a Notch" and "Because I Could Not Stop for Death."
Death as a theme was explored from many angles by Dickinson, and there are other poems which evaluate its effects from a more distant perspective. These would include "I Like a Look of Agony," "The Last Night that She Lived," "Death is the Supple Suitor" and of course "This World is not Conclusion."